Beckett (Stana Katic) aids in a missing-child investigation, only to find the lead FBI agent is her ex-boyfriend (Bailey Chase), for whom she has unresolved feelings. And Castle (Nathan Fillion) complicates matters even more when he butts in on the probe.

In the Season 1 finale, a plastic surgeon is found murdered in his car, and the ensuing probe involves surgery-obsessed patients and hush-hush procedures. Elsewhere, Alexis (Molly Quinn) attends her first prom; and Castle (Nathan Fillion) discovers extremely unsettling information about Beckett's (Stana Katic) past.

In the Season 2 opener, Kate (Stana Katic) and Castle (Nathan Fillion) are still at odds over his interference in her personal life, but the pair must work together when a man is found dead in a tree. Meanwhile, Castle struggles to finish his latest novel under the pressure of a looming deadline.

Two murders occur on the same night, prompting Castle (Nathan Fillion) to put his money where his mouth is by betting Ryan (Seamus Dever) and Esposito (Jon Huertas) that he and Beckett (Stana Katic) can solve their case first. But the two pairs must work together when both cases prove to be confoundingly bizarre.